Thermostatic regulator.



H. sANDvoss.4 THERMOSTATIC REGULATOR.

APPLICATION FILED AUGJG. i915.

Patented Oct. 16, 1917.

I s rf UNTTED STATES PATENT OFFICE.

HERMANN SANDVOSS. OF HEIDELBERG', GERMANY.

THERMOSTATIC REGULATOR.

To all whom (it may concern.' l

. Be it known that I, HERMANN SANDvoss, a subject of the German Emperor, and residing at 62 Leopoldstrasse, Heidelberg,

laters operated by an expansive uid or' the like, thermostatically controlled steam traps and the like, by means of whichde-g vice a damage to the apparatus shall be avoided, which might be feared inconsequence of the expansive -medium expanding still -further after. the valve body has already been moved on to its seat, or of the valve body being jammed by larger foreign bodies which have got into the valve.

, Such deviceshave already been disclosed with vwhich a piston is fitted in the vessel containing the expansive fluid and packed against the latter by an elastic corrugated hose, the packing hose, which has a sufficient resistance against compression, being displaceable by the expansive Huid only after the valve has been closed or the valve body arrested, so that said piston together with its packing hose will then act as` a buffer. This known arrangement, however, has the disadvanta that the buffer hose piston will, at a hig ly excessive heating of the ex ansive medium be so strongtlgr compresse in itself, and evenpossibly nt out sidewise, that when the overheating ceases, it can no more return into its.V originalposition. The apparatus fitted with this devicewill then no more operate accurately, because the space for the expansive liquid has become too large and the valve. will therefore close at a later moment, so that a higher temperature will be reached in the space or water controlled by the apparatus. It is the object of the present invention to avoid this diiiiculty.

The feature of the present invention consists in that the buffer hose piston bears against a spring of a suitable strength which is supported in the casing of the apparatus and is so arranged that when the expansive Huid expands abnormally, either both will yield simultaneously or first the spring and then the buffer hose, and are compressed 0r extended respectively, whereupon afterl the return of the piston packing hose the spring Specication of Letters Patent.

Patented oct. 16, 1917.

Application mea August as, 1915. serial mi. 47,553.

power of the latter is supported by the power of the auxiliary spring and will compensate a noxious shortening or elongation of the buffer hose which might have occurred.

Preferably the supportin bearing of thel auxiliary spring is adjusta ly -fitted to the casing of the a paratus, so that besides the automatic re lation of the buffer hose also a regulation y'hand is possible.

Inf the accompanying drawing va constructional form of the invention is shgwn in Figure 1 partly in elevation, partly iin section. Fig. 2 is a longitudinal section of a modification.

The' temperature regulator according to Fig.` 1 comprises a temperature Areceiving vessel a and a vessel c communicating theremeans of a peculiarly corrugated elasticA buffer hose s of a' given resistance against the expansive `fluid, and closelysoldered to \the bottom end of the piston and, at the top to al cap f screwed to the veel a. Thls piston is slidably guided with its rod g in a bore of the cap f. rllhe piston rod `g projects with -its free end out of the vessel a, being threaded at this end and carrying on said thread a nut k with the corresponding female thread; the extremeend of the iston rod is filed into a square. By suita ly tightening the nut h the piston can be raised or lowered, whereby its packing hose is simultaneously compressed, and the space available for the expansive uid is thereby regulated. In order to prevent such adjustment being performed by unauthorized ersons, the adjusting nut is covered wit al l In the space between the'nut 71, and the cap is fitted the auxiliary-spring 7c, which is made` of a smaller' strength than the buffer hose s and which bearsv at the top a ainst the cap z' and below against a the nut h.

When, now, the expansive fludis heated shoul er of no beyond the normal limit, the piston c will, if the valve d is closed beforehand, or the valve body is arrested, yield and be moved upward, whereby simultaneously the packing hose s and the spring la are compressed. When the. temperature sinks again to its normal degree the piston will under action of the hose s and the spring k return again into its initial position. Even if the com-` pression of the hose should have been so great that it has lost some of its spring, and can no more return by its own force into its initial position, it will nevertheless he returned thereto by the auxiliary spring 7c.

The constructional form according to Fig. 2 differs from the foregoing one in that the Cap Z of the nut h is arranged to sereW in the same. It is therefore poible to vary esst AVAILABLE ooe the force of spring by correspondnglyl 

